[RegCNET]Re: Dew point

[moetasim]

I have found more straight calculation for dewpoint. This can be easily implemented in HUMID1 
subroutine of sigma2P code. HUMID1 calculates RH as a fraction so adding following 


X = 1.-RH

DPD =(14.55+0.114*T)*X+((2.5+0.007*T)*X)^3+(15.9+0.117*T)*X^14
DWPT = T-DPD
 
(where DPD= Dew Point Depression)

will give you dewpoint temperature.


Moet



On Fri, 28 Oct 2005 16:27:17 -0400, Neil Davis wrote
> I am trying to calculate dewpoint for RegCM3 and just wanted to make 
> sure that my calculation was correct, I found a conversion on the 
> internet and wasn't sure that it would be correct.  This is how I am 
> calculating it.
> 
> vmr = qv*1000*(28.9644/18.01534)
> ph2o = vmr/1000*Pressure Level
> mil = 2.5*10^6
> p1=1/273
> td1 = (p1-(461/mil*(log(ph2o/6.11))))
> td=td1^ -1
> 
> where qv is the models specific humidity and the pressure level is 
> taken from the ctl file's value for a given z value in grads.
> 
> Thank you for your help
> Neil Davis
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